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NRC RIN: 3150-AH42 Publication ID: Fall 2023 
Title: Performance-Based Emergency Core Cooling System Acceptance Criteria [NRC-2008-0332] 
Abstract:

This rulemaking would amend the NRC's regulations to update the fuel cladding acceptance criteria for emergency core cooling system loss-of-coolant accident (LOCA) evaluations. The rule would establish new emergency core cooling system acceptance criteria that are performance-based and reflect research findings that identified new embrittlement mechanisms for fuel rods with zirconium alloy cladding under LOCA conditions. The scope of this rulemaking would affect nuclear power reactor licensees. The rulemaking addresses two petitions for rulemaking (PRM-50-71 and PRM-50-84). 

 
Agency: Nuclear Regulatory Commission(NRC)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 10 CFR 50   
Legal Authority: 42 U.S.C. 2201    42 U.S.C. 5841   
Legal Deadline:  None
Timetable:
Action Date FR Cite
ANPRM  08/13/2009  74 FR 40765   
ANPRM Comment Period End  10/27/2009    
NPRM  03/24/2014  79 FR 16106   
NPRM Comment Period End  08/21/2014 
Second NPRM  04/20/2015  80 FR 21658   
Second NPRM Comment Period End  07/06/2015 
Final Rule  12/00/2023 
Additional Information: The final rule to amend 10 CFR 50.46c was provided to the Commission on March 16, 2016 (SECY-16-0033) (ADAMS Accession No. ML15238A947). This rulemaking formerly was titled "50.46b Fuel Cladding."
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Dennis Andrukat
Nuclear Regulatory Commission
Office of Nuclear Material Safety and Safeguards,
Washington, DC 20555-0001
Phone:301 415-3561
Email: dennis.andrukat@nrc.gov